Right,
Assassins creed 1 was pants and it put so many people off with it being so boring. If you took the gamble and got 2 I found alot of people then got hooked
AC 2 was brilliant
AC brotherhood was really good
AC revelations was MEH and sowed up some of the story (hence the name)
AC 3 graphically looked amazing and gameplay was top but the story really lost its way (It was the first one away from Altair and Ezio)
AC 4 looks very sea based so Im not too sure how its going to be..